Override for OEM audio signal equalizer

Abstract

Apparatus and methods for processing an audio signal. The apparatus may include a digital signal processor (“DSP”) configured to receive an audio signal from a vehicular audio signal line. The audio signal may include a flat component and a compensatory component. The flat component may correspond to the audio signal in a state before combination with the compensatory component. The compensatory component may include an OEM EQ component. The apparatus may include a microprocessor in electronic communication with the DSP. The microprocessor may be configured to retrieve from the memory a restorative signal component. The microprocessor may be configured to instruct the DSP to apply the restorative signal component to the audio signal to reduce the audio signal to the flat component.

What is claimed is: 
     
       1. An apparatus for processing an audio signal, the apparatus comprising:
 a digital signal processor (“DSP”) configured to receive an audio signal from a vehicular audio signal line, the audio signal including a flat component and a compensatory component, the compensatory component including an equalizer component applied by an equalizer; 
 a microprocessor in electronic communication with the DSP; and 
 machine-readable memory in electronic communication with the microprocessor; 
 wherein the microprocessor is configured to:
 retrieve, from the memory, a restorative signal component; and 
 apply, via the DSP, the restorative signal component to the audio signal to remove the compensatory component of the audio signal and acquire the flat component. 
 
 
     
     
       2. The apparatus of  claim 1  wherein the restorative signal component corresponds to a vehicle state value. 
     
     
       3. The apparatus of  claim 2  wherein the restorative signal component corresponds to one of a plurality of audio volume control settings. 
     
     
       4. The apparatus of  claim 1  wherein the restorative signal component corresponds to a vehicle configuration parameter. 
     
     
       5. The apparatus of  claim 4  wherein the restorative signal component further corresponds to a vehicle state value. 
     
     
       6. The apparatus of  claim 5  wherein the vehicle state value is an audio volume control setting. 
     
     
       7. The apparatus of  claim 4  wherein the vehicle configuration parameter corresponds to: a vehicle year; a vehicle make; and a vehicle model. 
     
     
       8. The apparatus of  claim 1  wherein the microprocessor is further configured to instruct the DSP to add an equalization component to the audio signal after applying the restorative signal component to the audio signal. 
     
     
       9. The apparatus of  claim 8  wherein the equalization component includes a vehicle state component. 
     
     
       10. The apparatus of  claim 9  wherein the vehicle state component corresponds to one of a plurality of audio volume control settings. 
     
     
       11. The apparatus of  claim 8  wherein the equalization component includes a vehicle configuration component. 
     
     
       12. The apparatus of  claim 11  wherein the equalization component further corresponds to a vehicle state value. 
     
     
       13. The apparatus of  claim 12  wherein the equalization component corresponds to one of a plurality of audio volume control settings. 
     
     
       14. A method for providing a sound signal, the method comprising:
 receiving an electrical audio signal having a flat component and a compensatory component, the compensatory component including an equalizer component applied by an equalizer; 
 retrieving, from a memory of a microprocessor, a restorative signal component; and 
 applying the restorative signal component to the audio signal to remove the compensatory component of the audio signal and acquire the flat component. 
 
     
     
       15. The method of  claim 14  wherein the retrieving the restorative signal component comprises:
 selecting from machine readable memory a restorative function corresponding to a vehicle state value on a data bus. 
 
     
     
       16. The method of  claim 15  wherein the vehicle state value corresponds to one of a plurality of audio volume control settings. 
     
     
       17. The method of  claim 14  wherein the retrieving the restorative signal component comprises: selecting from machine readable memory a restorative function corresponding to a vehicle configuration parameter. 
     
     
       18. The method of  claim 17  wherein the restorative function further corresponds to a vehicle state value. 
     
     
       19. The method of  claim 18  wherein the vehicle state value corresponds to one of a plurality of audio volume control settings. 
     
     
       20. The method of  claim 17  wherein the vehicle configuration parameter corresponds to: a vehicle year; a vehicle make; and a vehicle model. 
     
     
       21. The method of  claim 17  wherein the selecting includes receiving the vehicle configuration parameter from a vehicle data bus. 
     
     
       22. The method of  claim 14  further comprising adding an equalization component to the audio signal after applying the restorative signal component to the audio signal. 
     
     
       23. The method of  claim 22  wherein the equalization component includes an active noise cancellation component. 
     
     
       24. The method of  claim 22  wherein the equalization component includes a vehicle state component. 
     
     
       25. The method of  claim 24  wherein the vehicle state component corresponds to one of a plurality of audio volume control settings.